Authentication method password not supported by the server at this stage.

Authentication method password not supported by the server at this stage. 如果程序连接ssh服务器,密码验证时出现这个错误,用下面的方式可以解决, 在服务器端 查看 /etc/ssh/sshd_config 文件 查找 PasswordAuthentication no 这个项,并把这个项改为 yes,问题解决 # $OpenBSD: sshd_config,v 1.70 2004/12/23 23:11:00 djm Exp $ # This is the sshd server system-wide configuration file. See # sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin # The strategy used for options in the default sshd_config shipped with # OpenSSH is to specify options with their default value where # possible, but leave them commented. Uncommented options change a # default value. #Port 22 #Protocol 2,1 #AddressFamily any #ListenAddress 0.0.0.0 #ListenAddress :: # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 #HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_dsa_key # Lifetime and size of ephemeral version 1 server key #KeyRegenerationInterval 1h #ServerKeyBits 768 # Logging #obsoletes QuietMode and FascistLogging #SyslogFacility AUTH #LogLevel INFO # Authentication: #LoginGraceTime 2m #PermitRootLogin yes #StrictModes yes #MaxAuthTries 6 #RSAAuthentication yes #PubkeyAuthentication yes #AuthorizedKeysFile .ssh/authorized_keys # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don't trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # Don't read the user's ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # To disable tunneled clear text passwords, change to no here! PasswordAuthentication no #PermitEmptyPasswords no # Change to no to disable s/key passwords #ChallengeResponseAuthentication yes # Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes #KerberosGetAFSToken no # GSSAPI options #GSSAPIAuthentication no #GSSAPICleanupCredentials yes # Set this to 'yes' to enable support for the deprecated 'gssapi' authentication # mechanism to OpenSSH 3.8p1. The newer 'gssapi-with-mic' mechanism is included # in this release. The use of 'gssapi' is deprecated due to the presence of # potential man-in-the-middle attacks, which 'gssapi-with-mic' is not susceptible to. #GSSAPIEnableMITMAttack no # Set this to 'yes' to enable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication mechanism. # Depending on your PAM configuration, this may bypass the setting of # PasswordAuthentication, PermitEmptyPasswords, and # "PermitRootLogin without-password". If you just want the PAM account and # session checks to run without PAM authentication, then enable this but set # ChallengeResponseAuthentication=no UsePAM yes #AllowTcpForwarding yes #GatewayPorts no X11Forwarding yes #X11DisplayOffset 10 #X11UseLocalhost yes #PrintMotd yes #PrintLastLog yes #TCPKeepAlive yes #UseLogin no #UsePrivilegeSeparation yes #PermitUserEnvironment no #Compression yes #ClientAliveInterval 0 #ClientAliveCountMax 3 #UseDNS yes #PidFile /var/run/sshd.pid #MaxStartups 10 # no default banner path #Banner /some/path # override default of no subsystems Subsystem sftp /usr/lib/ssh/sftp-server # This enables accepting locale enviroment variables LC_* LANG, see sshd_config(5). AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT AcceptEnv LC_IDENTIFICATION LC_ALL zxin10@SDJN-PS-MMS4-DB1:~> vi /etc/ssh/sshd_config # possible, but leave them commented. Uncommented options change a # default value. #Port 22 #Protocol 2,1 #AddressFamily any #ListenAddress 0.0.0.0 #ListenAddress :: # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 #HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_dsa_key # Lifetime and size of ephemeral version 1 server key #KeyRegenerationInterval 1h #ServerKeyBits 768 # Logging #obsoletes QuietMode and FascistLogging #SyslogFacility AUTH #LogLevel INFO # Authentication: #LoginGraceTime 2m #PermitRootLogin yes #StrictModes yes #MaxAuthTries 6 #RSAAuthentication yes #PubkeyAuthentication yes #AuthorizedKeysFile .ssh/authorized_keys # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don't trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # Don't read the user's ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # To disable tunneled clear text passwords, change to no here! PasswordAuthentication no
<think>好的,我现在需要解决用户遇到的MySQL连接错误:MySqlException: Authentication method 'caching_sha2_password' not supported by any of the available plugins。根据用户提供的引用资料,这个问题通常是因为MySQL 8.0默认使用了新的认证插件caching_sha2_password,而旧版本的客户端或某些应用程序不支持这种认证方式,导致连接失败。 首先,我需要确认用户的具体情况。用户提到从MySQL 5.7升级到8.0后出现此问题,因此可能是客户端库没有更新,仍然使用旧的mysql_native_password插件。根据引用[1]、[5]中的建议,解决方法是在MySQL服务器配置文件中修改默认认证插件为mysql_native_password。 接下来,步骤应该是指导用户如何修改my.ini配置文件,并重启MySQL服务。引用[4]详细说明了在[mysqld]部分添加default_authentication_plugin=mysql_native_password,并重启服务。同时,用户可能需要更新密码,因为更改认证插件后,现有用户的密码可能需要重新设置以兼容旧插件。 另外,用户可能需要检查连接字符串是否有指定使用旧插件,或者升级客户端库到支持caching_sha2_password的版本。但根据错误信息,用户当前客户端不支持,所以修改服务器配置是更直接的解决方案。 需要提醒用户修改配置文件的位置,不同安装方式路径可能不同,比如引用[5]提到的路径是C:\ProgramData\MySQL\MySQL Server 8.0\my.ini。同时,修改后必须重启MySQL服务才能生效,如引用[4]所述使用net stop mysql和net start mysql。 最后,用户可能需要重新创建用户或更新用户密码,确保使用mysql_native_password插件。例如使用ALTER USER语句修改用户认证方式。这可以避免后续连接问题。</think>### 分步解决方案 1. **修改MySQL配置文件** 找到MySQL 8.0的配置文件`my.ini`(Windows默认路径为`C:\ProgramData\MySQL\MySQL Server 8.0\my.ini`,Linux路径通常为`/etc/mysql/my.cnf`)。在`[mysqld]`配置段下方添加: ```ini default_authentication_plugin=mysql_native_password ``` 这一步强制MySQL服务器使用旧版认证插件[^1][^4][^5]。 2. **重启MySQL服务** 修改后需重启MySQL服务使配置生效: - **Windows**: ```bash net stop mysql net start mysql ``` - **Linux**: ```bash systemctl restart mysql ``` 重启后服务器将默认使用`mysql_native_password`插件[^4]。 3. **更新用户密码(可选)** 如果现有用户仍使用`caching_sha2_password`插件,需通过以下SQL修改用户密码: ```sql ALTER USER '用户名'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码'; FLUSH PRIVILEGES; ``` 此操作确保用户认证方式与服务器配置一致。 4. **检查客户端兼容性** 如果仍无法连接,检查客户端驱动版本是否支持MySQL 8.0。建议升级至最新驱动(如Connector/NET 8.0+、JDBC 8.0+)[^1]。 --- ### 总结流程图 ``` 修改my.ini → 重启服务 → 更新用户密码 → 检查客户端驱动 ``` ---
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